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On Wed, 2005-01-19 at 23:16, Jim Adney wrote: > > > > The other side of the dimmer switch on the column is grounded to a clip > > that is part of the fuse box mounting. If the fuse box does not have > > that screw in it, or is not bolted down, you may not have a complete > > circuit. > > If that connection is there, I certainly never noticed it. OTOH, I had always > assumed that the switch got its ground at the TS switch mounting, but an > inspection of a half dozen switches in my basement shows that both sides of the > switch connect to wires that run back out of the column. I would have SWORN > that it was otherwise.... > > Russ, how sure are you about that connection beneath the fuse box screw? I've > never noticed it, and I sure think I would have if it was there on cars that I > worked on. Is it possible that this was how it was done in early cars? On the > later cars, '69-, there would have been the cluster of ground lugs up under the > dash which would have been more natural, and the latest wiring diagram in the > bentley shows this ground going to the back of the speedo. > > I don't think it was there on my '68, either, but earlier than that and I > really don't have an opinion. What year are we discussing, anyway? > > In answer to the original question, the switch just connects the relay to > ground momentarily, which energizes the relay coil and makes the relay change > states. So BOTH wires have to be intact, the switch needs to make decent > contact, and the "other side" of the switch needs to be connected, somewhere, > to a good ground. You are right Jim, I dropped the fuse box on my '71, and it is not there. It is slightly above grounded to the clips that are spot welded into the brace. The way the Bently shows it, it could be anyplace, as they show a "daisy chain" of grounds. My '66 has the clip on the fuse box. I didn't check the Ghia. BTW, did you here that VW is putting the dimmer back on the floor?? People keep tripping the air bag with their toes when diming the headlights. ;=] -- Russ Wolfe '71 FB AT '66 FB MT '64 T34 (not running) '65 T1 (not running) russw@classicvw.org http://www.classicvw.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~